fix: [IEL-56] Pdf flashing during sign

[freddi301]

Short description

This PR addresses a graphical glitch happening when viewing pdf documents to sign.
It happens when changing screen. There three variations of this:

• viewing the document for the first time a white blink happens
• viewing a subsequent document shows the old one for a split second
• viewing clauses if affected by the same

original_issue.mp4

List of changes proposed in this pull request

TODO

How to test

TODO

[github-actions]

Jira Pull Request Link

This Pull Request refers to Jira issues:

• IEL-56

[github-actions]

PR Title Validation for conventional commit type

✅ All good! PR title follows the conventional commit type.

[freddi301]

for investigation purposes, this commit 7c15d18 hides wiht opacity 0 the pdf component instance while loading. This may indicated that the problem might be that old previous content is shown while loading the most recent one.
Not all instances of the problem are solved and other solution must be found.
The file is FciDocumentsScreen.tsx, also the fix should be replicated onto DocumentWithSignature.tsx